.header {
    width: 100%;
    background-color: white;
    padding: 15px 0;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s, padding 0.3s;
    margin: 0 auto;
}

.sticky {
    position: fixed;
    top: 80px;
    left: 0;
    right: 0;
    z-index: 2;
    background-color: #ffffff;
    padding: 10px 0;
}